This commit addresses an issue where layout attributes could become undefined during the block migration process. Alongside this fix, several updates were made to align the migration logic with the new `ProductCollectionDisplayLayout` types:
- Added logic to handle `undefined` layout attributes, defaulting to `DEFAULT_ATTRIBUTES.displayLayout`.
- Removed `ProductGridLayout` and `ProductGridLayoutTypes` from the types file.
- Imported `LayoutOptions` and `ProductCollectionDisplayLayout` from the product-collection module.
- Updated the `mapLayoutType` and `mapLayoutPropertiesFrom...` functions to use the new layout types.
- Updated transformation functions like `transformProductTemplate` and `transformPostSummary` to use the new types.
These changes not only resolve the issue with undefined layout attributes but also align the codebase with the new layout options, enhancing code maintainability.